57122
domain: N
Appears in sequences
- Number of 4-dimensional polyominoes with n cells.at n=8A006767
- Duplicate of A024537.at n=12A018905
- a(n) = floor( a(n-1)/(sqrt(2) - 1) ), with a(0) = 1.at n=13A024537
- Numbers k that divide 9^k + 7^k.at n=26A045605
- Triangle T(n,d) = number of distinct d-dimensional polyominoes (or polycubes) with n cells (0 < d < n).at n=31A049429
- Triangle read by rows: T(n,d) is the number of distinct properly d-dimensional polyominoes (or polycubes) with n cells (n >= 1, d >= 0).at n=40A049430
- Numbers k such that k*(k - 1)/2 is a square.at n=7A055997
- Numbers k that divide 4^k + 3^k + 1.at n=9A057351
- Numbers n such that n | 11^n + 9^n + 7^n + 5^n + 3^n + 1.at n=34A057832
- Duplicate of A069743.at n=4A069742
- Let M_n be the n X n matrix M_(i,j)=1/(3^i+3^j), then a(n) is the numerator of det(M_n).at n=4A069743
- Sum of two powers of 13.at n=14A072390
- Terms m of A003337 such that m+1 is also in A003337. I.e., smaller one of two consecutive numbers, both equal to a sum of three 4th powers.at n=7A085322
- Solutions k to the Diophantine equation k = 2n^2 = m^2+1.at n=3A088920
- Expansion of g.f. (1-x-x^2)/(1-x-3*x^2-x^3).at n=14A097075
- Numbers of the form (2^i)*(13^j).at n=44A107326
- a(n) = 2*A079291(n) (twice squares of Pell numbers).at n=7A114619
- Consider all Pythagorean triples (X,X+1,Z) ordered by increasing Z; sequence gives Z-X values.at n=6A115599
- Numbers of the form (square + 1) that are not squarefree.at n=24A124809
- a(n) = 81*n^2 - 72*n + 17.at n=27A154277